Geodesic
Self-adjoint boundary problems for a second-order differential equation with unbounded operator coefficient
Funkcionalʹnyj analiz i ego priloženiâ, Tome 5 (1971) no. 1, pp. 10-21 
M. L. Gorbachuk. Self-adjoint boundary problems for a second-order differential equation with unbounded operator coefficient. Funkcionalʹnyj analiz i ego priloženiâ, Tome 5 (1971) no. 1, pp. 10-21. http://geodesic.mathdoc.fr/item/FAA_1971_5_1_a1/
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     url = {http://geodesic.mathdoc.fr/item/FAA_1971_5_1_a1/}
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